In this study, nanocrystalline cellulose (NCC) was used for increasing the bonding strength of urea-formaldehyde (UF) resin adhesive, with a reduction formaldehyde (HCHO) emissions. The surface NCC modified by 3-aminpropyltriethoxysilane (APTES) and 3-methacryloxypropyltrimethoxysilane (MPS) lack compatibility UF adhesive. characterized X-ray powder diffraction (XRD), thermogravimetric analysis (TG), wetting property. HCHO emission adhesive were tested according to Chinese National Standards...

Abstract In an era where technological advancement and sustainability converge, developing renewable materials with multifunctional integration is increasingly in demand. This study filled a crucial gap by integrating energy storage, multi-band electromagnetic interference (EMI) shielding, structural design into bio-based materials. Specifically, conductive polymer layers were formed within the 2,2,6,6-tetramethylpiperidine-1-oxide (TEMPO)-oxidized cellulose fiber skeleton, mild...

Abstract Poplar wood ( Populus euramericana cv. “I-214”) has been impregnated by pulse dipping at 0.7–0.8 MPa for 30 min with a mixture of methylolurea and sodium silicate, the sol modifier cured within micropores in situ gel polymerization kiln drying, so that Si-O-Si framework was formed. The treated acquired higher mechanical strength its hygroscopicity lowered. It demonstrated X-ray diffraction silicate crystallized interfibrillar region cell wall. Fourier transform infrared spectra...

Natural fiber is a renewable resource characterized by its low cost and environmental friendliness.However, flame retardant properties are one of the biggest limitations for preparation composite materials that need to be improved.In this work, novel complex consisting aluminum hydroxide (ALH) decabromine diphenyl oxide (PBDE) was proposed inhibit thermal decomposition.Flameretarding paper made from softwood pulp retardant.The retardants were studied using thermogravimetric analysis...

Urea-formaldehyde prepolymer and hot-press drying were used to improve the properties of poplar wood. The wood was impregnated with using a pulse-dipping machine. timbers compressed dried by multilayer kiln. rate more rapid during chemical modification than conventional kiln-drying. In addition, timber also enhanced obviously. When compression 28.6%, basic density, oven dry density air-dried modified improved 22%, 71%, 70%, respectively. bending strength compressive parallel grain increased...

In this study, the optical and mechanical properties of polyurethane were improved by modified nanocrystalline cellulose (NCC). The surface NCC was 3-glycidoxypropyltrimethoxysilane (GPTMS) 3-methacryloxy-propyltrimethoxysilane (MPS) to overcome lack compatibility with polyurethane. Polyurethane characterized wetting property, X-ray powder diffraction, thermogravimetric analysis. pencil hardness, specular gloss, abrasion resistance determined using methods Chinese National Standards GB/T...

Nanocrystalline cellulose (NCC) was used to improve the anti-yellowing property of polyurethane (PU). The NCC modified with 3-glycidoxypropyltrimethoxysilane (GPTMS) enhance its compatibility PU, and surface-modified characterized by contact angle (CA), X-ray powder diffraction (XRD), thermogravimetric analysis (TG). NCC/PU composite examined scanning electron microscopy (SEM), Fourier transform infrared spectrophotometer (FT-IR), photoelectron spectroscopy (XPS). Anti-yellowing determined...

Abstract The flame retardancy and dimensional stability of wood were improved by pretreating with succinic anhydride (SA), then impregnating the SA-treated melamine-urea-formaldehyde (MUF) resin. obtained graft anchors on cell wall, which reduced water-absorbing groups enhanced retention MUF resin, leading to an efficiently fire-proof protection layer water repellency. Field-emission scanning electron microscopy Fourier-transform infrared spectroscopy demonstrated that grafting experiment...

Recently, Ailanthus altissima wood has received increased attention in China. Although a number of advantages, such as fast-growing character and high density, the low dimensional stability is restraining factor. Chemical modification could be feasible way to overcome drawbacks. The aim this research was study physical chemical properties veneers treated by urea-formaldehyde pre-polymer impregnation compression drying. results showed that approach not only significantly wood, but also...

Nanocrystalline cellulose (NCC) was used as a modifier for waterborne polyurethane (WPU) to investigate the water and ethanol resistance of WPU-NCC composites. The NCC surface modified with γ-glycidoxypropyltrimethoxysilane (GPTMS) γ-ammnonimpropylmethyldimethoxysilane (APMDS) improve its compatibility (WPU), indicated by contact angle (CA). characteristic properties WPU control group were compared Fourier-transform infrared spectroscope (FTIR), X-ray powder diffraction (XRD), scanning...

A design of experiments (DoE) approach was applied to the development and optimization manufacturing process prepare linagliptin. DoE techniques such as a central composite face-centered fractional factorial were obtain critical parameters establish optimal reaction conditions. With process-related impurities determined successfully removed, robust high-yielding high-purity procedure identified, which has been demonstrated at 100 g scale level desired product in 68% overall isolated yield...

ABSTRACT A cellulose‐based polyethylenimine modified graphene oxide (PEI‐GO) composite aerogel is fabricated through the alkaline–urea aqueous system. Inspired from performance of nanocarriers in gene delivery, this article proposes a pathway to disperse GO green environment with strong electrolyte concentrations via decorated branched PEI. The entire system shows good miscibility and stability. Meanwhile, dynamic light scattering results indicate that PEI‐GO cellulose chains become...

A novel biobased porous aerogel was synthesized using physical mixing, freeze-drying, and in-situ growth methods. Zeolitic imidazolate frameworks-8 (ZIF-8) were grafted onto the surface of CS/CNF solid composite to form a ZIF-8@CS/CNF aerogel. The structural characteristics adsorption potential investigated. It found that specific area 206 m2/g, water stability CNF enhanced by incorporating CS. Meanwhile, isotherm kinetics fit pseudo-second-order kinetic model (R2 = 0.96) Langmuir 0.97) with...

ABSTRACT A prepolymer was used to prepare wood/prepolymer composites by a pulse‐dipping machine. The mechanical properties and dimensional stability were evaluated. characterization of natural modified woods performed Fourier transform infrared spectroscopy, 13 C‐NMR X‐ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) with energy‐dispersive analysis (EDXA). Cross‐polarization/magic‐angle spinning revealed that the in situ polymerization between hydroxyls wood structure...

Effects of ultrasonic pretreatment on the bleaching chemimechanical pulp (CMP) fiber triploid Chinese white Poplar were investigated. Before single-stage hydrogen peroxide bleaching, CMP was sonicated at 1.5% consistency and 50oC for 20min with 90% amplitude 20s pulse; these conditions showed most favorable effect a 3.5% ISO increase brightness, reaching final value 80.2% ISO. The benefit may be because ultrasound can accelerate heterogeneous reactions, which arise from impingement microjets...

ABSTRACT Chemical modification of wood is a potential way to obtain high quality wood. In this study, methylolurea was used modify the polar by in situ polymerization. The mechanical properties and dimension stability wood‐methylourea composites were investigated, modified samples also characterized scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) X‐ray diffraction (XRD). mechanism polymerization presented graphs. test results showed that dimensional natural...

With the widespread use of electronic communication devices, ultra-thin, flexible, and high-performance electromagnetic interference (EMI) shielding materials are widely used to prevent radiation pollution. Moreover, graphene-reinforced polymer-based nanocomposites have received increasing attention in field EMI because their excellent electrical properties. In this work, ultrathin flexible nickel/reduced graphene oxide/cellulose nanofiber (Ni/RGO/CNFs) composite paper was fabricated using a...